SU1794134A3 - Precast pile - Google Patents

Description

The invention relates to construction, in particular to pile foundations, arranged mainly on weak and subsiding soils.

The closest to the invention in technical essence and the achieved result is a driven pile, which includes a screw shaft expanding upward.

In a known pile, the outer surface is made with a ledge located along a one-way spiral.

The disadvantage of such a pile is the insufficient bearing capacity due to the unidirectionality of the helical spiral and the flat spiral side surface.

The aim of the invention is to increase the bearing capacity.

Figure 1 shows the described pile with four approaches of oppositely directed helical lines, with four right and four left broken helical lines (surfaces): figure 2 - view A in figure 1; Fig. 3 is an axonometric projection of the pile in Fig. 1; figure 4 - pile with six right and six left helical broken lines (surfaces); figure 5 - view B in figure 4.

The driven pile (Figs. 1 and 4) consists of a tapered shaft 1, with its large base facing upwards.

The barrel 1 in height is made composite of multifaceted sections 2, the lateral surface of each of which is formed by an even number, not less than six adjacent lateral sides of alternating equilateral 3 and isosceles 4 triangles.

In Fig. 1, sections 2 of the trunk 1 are assembled from alternately connected four equilateral 3 and four isosceles 4 triangles, and in Fig. 4, sections 2 of the trunk 1 are assembled from six equilateral 3 and six isosceles 4 triangles.

The sides of the equilateral 3 and isosceles 4 triangles in each section 2 are equal to each other, and the bases of the 5 isosceles 1794134 АЗ of the equal triangles 4 are larger than their lateral sides 6 and 7.

The total number of equilateral 3 and the number of isosceles 4 triangles, at least equal to six, must be an even number and has no restrictions in the direction of their increase. In each underlying section, the triangles of the same name are displaced relative to each other with the location of their lateral sides along the length of the barrel, but not less than three multidirectional broken helical lines with the same pitch and number of entries. The pitch of the screw lines is variable along the barrel.

Figures 1 and 2 show by a thickened line one of the four right broken helical lines 8, 9, 10, 11, 12, 13, 14 and one of the four left broken helical lines 8, 15,10,1.6,17,18,14 ... 4 and 5 show a thickened line one of the six left broken helical lines 19, 20, 21, 27, 22, 23, 24 and one of the six right broken helical lines 19, 25, 26, 27, 28,29 , 30. On the outer surface of the trunk, diamond-shaped niches are formed, different in area and size. In Fig. 3, two of such diamond-shaped niches are shown in thickened line, which are delimited in the drawing by the thickened line 10-16-31-11 and 11-31-32-12.

The pitch S1 and S2 of the helical lines, both right and left, is the same, but varies along the length of the trunk, namely, increases towards the base of the pile.

To facilitate the immersion, the pile is equipped with a tip 33, the lateral surface of which can be formed from equilateral or isosceles triangles.

The described piles are immersed in the ground by driving with pile driving units (not shown in the drawings). When immersed due to the conical ™ of broken helical lines, the soil is wedged, i. E. The soil displaced by the pile is compacted by the lateral surface of the pile.

With the further immersion of the pile due to the oppositely directed helical broken lines along the outer surface, additional soil compaction is created in the vertical plane. Around the outer surface of the trunk due to the action of forces in the horizontal and vertical directions, multi-threaded multi-screw compacted soil layers are created, which increases the resistance of the soil and, accordingly, the bearing capacity of the pile.

Compaction of the soil also occurs due to the resistance arising on the lateral surface of the pile due to the presence of niches - diamond-shaped depressions, different in area and size, which increases compaction in different planes and increases the bearing capacity of the pile.

Around the outer lateral surface of the pile, a multi-turn compacted soil layer is created, which increases the resistance of the soil and, accordingly, the bearing capacity of the pile.

Claims (1)

Claim A driven pile, including a screw barrel expanding upward, characterized in that, in order to increase the bearing capacity, the barrel is made in height of a composite of multifaceted sections, the lateral surface of each of which is formed by an even number, at least six, adjacent to each other lateral sides alternating equilateral and isosceles triangles, the sides of which within each section are equal to each other, and the base of each isosceles triangle exceeds the size of the side, and in each underlying section the triangles of the same name are displaced relative to each other with the location of their lateral sides along the length of the trunk, by at least three multidirectional helical lines of variable pitch length of the trunk and the formation of diamond-shaped niches of different sizes along it. FIG. 1 Fig!